/**
 * Copyright (C) cedarsoft GmbH.
 *
 * Licensed under the GNU General Public License version 3 (the "License")
 * with Classpath Exception; you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *         http://www.cedarsoft.org/gpl3ce
 *         (GPL 3 with Classpath Exception)
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 3 only, as
 * published by the Free Software Foundation. cedarsoft GmbH designates this
 * particular file as subject to the "Classpath" exception as provided
 * by cedarsoft GmbH in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 3 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 3 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
 * or visit www.cedarsoft.com if you need additional information or
 * have any questions.
 */

package com.exadel.googleregistrator;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.*;
import java.io.*;

/*порядок работы с классом:
1)создаем экземпляр класса
2)берем имена с помощью метода getNextName
3)заканчиваем работу методом closeDocument
*/

public class Parser {
    private Document document;
    private int currentRecord;
    private XPath xpath;

    public Parser() {
        BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader("src\\data\\config.txt"));
            document = makeDocument();
            xpath = XPathFactory.newInstance().newXPath();
            currentRecord = Integer.parseInt(br.readLine());
            br.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public String getFirstName(){
        String xpathExpression = "/html/body/div/table/tr[" + currentRecord + "]/td[1]/text()";
        XPathExpression expression = null;
        try {
            expression = xpath.compile(xpathExpression);
            Node firstName = (Node) expression.evaluate(document, XPathConstants.NODE);
            currentRecord++;
            return firstName.getNodeValue();
        } catch (XPathExpressionException e) {
            e.printStackTrace();
        }
        return "";
    }

    public String getLastName(){
        String xpathExpression = "/html/body/div/table/tr[" + currentRecord + "]/td[1]/text()";
        XPathExpression expression = null;
        try {
            expression = xpath.compile(xpathExpression);
            Node lastName = (Node) expression.evaluate(document, XPathConstants.NODE);
            return lastName.getNodeValue();
        } catch (XPathExpressionException e) {
            e.printStackTrace();
        }
        return "";
    }

    public void closeDocument() throws Exception {
        FileWriter fstream = new FileWriter("src\\data\\config.txt");
        BufferedWriter out = new BufferedWriter(fstream);
        out.write(currentRecord + "");
        out.close();
    }

    private Document readDocument(String filename) throws ParserConfigurationException, SAXException, IOException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setNamespaceAware(false);
        DocumentBuilder builder = factory.newDocumentBuilder();
        return builder.parse(filename);
    }

    private Node getCurrentRecordNode() throws Exception {
        String xpathExpression = "/html/body/lastrec/text()";
        XPathExpression expression = xpath.compile(xpathExpression);
        return (Node) expression.evaluate(document, XPathConstants.NODE);
    }

    private Document makeDocument() throws IOException, ParserConfigurationException, SAXException {

        String filename = "src\\data\\namesFinal.htm";
        return readDocument(filename);
    }


}